Valve for exhaust-pipes.



H. G. CONRAD. VALVE FOR EXHAUST PIPES. APPLICATION FILED mm, 1912.

1,064,291. Patented June 10,1913.

7 I I I n 1 l K r I I I Qfnve 722 0 7' f/gy (Z. 0072 rid 5y HENRY Gr.CONRAD, OF CHICAGO, ILLINOIS.

VALVE FOB, EXHAUST-PIPES.

Application filed August 5, 1912.

fl '0 all whom it may concern:

Be it known that I, HENRY G. CONRAD, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Valves for Exhaust-Pipes, of which the following is a specification.

It is a well known fact that a vacuum or suction cleaning system whenused in connection with wood working and other tools which have atendency to produce a great amount of chips, shavings and other refuse,efiect a great saving and convenience, and it is customary to equip suchshop where such tools are used, with a suction system for drawing air inthrough the pipes, the air carrying with it the shavings, chips and thelike. Owing to the fact that the position of the machines is frequentlychanged and to the further fact that only a few of the machines aregenerally in operation at one time and that during different operationsonly different portions of the machines need be cleaned, it is customaryto place the fixed and permanent system in position for a certain numberof tools and to connect these tools with the machine or tool to becleaned by a removable pipe. The system is then designed to suck air inthrough only a few of the outlets and it is necessary to always closethe outlets which are not actively in use. In the past, workmen havebeen in the habit of after withdrawing the removable pipe placing ablock of wood over the outlet and allowing the suction of air to holdthe block in position, but if for any reason the vacuum in the systemshould drop or the fan slow down, the suction will not be sufficient tohold the blocks in position and they will all drop off, and thus whenthe pressure in the vacuum again arises, there will not be sufficientsuction at the working points to carry the load, owing to the fact thatthe workmen can never be relied upon to replace the blocks which havedropped off. My invention therefore takes the place of this haphazardmethod of using blocks of wood, and automatically closing the outletswhenever they are not being used. I do this by substituting for theblocks of wood an automatic valve flap which swings over the valveopening the minute the workman withdraws the removable pipe and whichmay conveniently be Specification of Letters Patent.

Fatented June 10,1913.

Serial No. 713,365.

swung to one side to permit the positioning of another pipe.

My invention therefore relates to improvements in valves for exhaustpipes and has for its object more particularly to supply a new andimproved intake valve for pipes in a suction exhaust system for removingthe shavings, chips and debris from the wood-working tool, and has forone object to provide a new and improved valve which shall beautomatically operable when the suction pipe leading to the tool isdisconnected, which shall be conveniently attached to the system, andwhich shall not interfere with the connections of the pipes leading tothe machines.

It is illustrated diagrammatically in one form in the accompanyingdrawing, wherein Figure 1 is a side elevation with part-s broken away ofa wood-working tool showing the suction system in operation connected tothe tool by an exhaust pipe; Fig. 2 is a section along the line 2-2 ofFig. 1; Fig. 3 is a section along the line 33 of Fig. 2.

Like parts are indicated by like letters throughout the several figures.

The tool A which I have here shown for the purpose of convenience as arotary saw, has leading from the table a removable exhaust pipe B havingan exhaust head 0 thereon. The upper end of the pipe B fits into thepipe D which in turn communicates with the main E in connection with theexhaust fan F. The two-part ring G which surrounds the end of the pipe Dis held together by the bolts and nuts H and I. The bolt H also acts asa pivot for the counterbalance weight J, which weight is provided withthe forwardly extending arm K to which is riveted the valve flap L,which flap is provided with the upwardly bent flange M which surroundsthe end of the pipe D. The tongues N bent upwardly from the pipe Dengage the lower edge of the ring G to hold it more securely inposition.

The operation of my device will be clear from the drawing andspecification, and as long as the removable suction pipe is connectedwith the system, air will pass through it, when the pipe is withdrawn,the weight of the counterbalance will cause the valve leaf or flap toswing over and close the end of the pipe. When it is desired to replacethe removable pipe, the end of the pipe can easily be caughtagainst theedge of the 11% valve leaf and the valve thus swung upwardly and out ofthe way, permitting the entrance of the pipe.

It will be evident that while I have shown in my drawings an operativedevice, still many changes might be made in the size, shape andarrangement of parts without (ileparting materially from the spirit ofmy invention, and I wish therefore that my drawings be regarded as in asense diagrammatie.

I claim:

1. A suction cleaning system for wood working tools and the like havinga plurality of fixed conduits and intake ports therefor, removablesuction pipes and automatic means for closing said ports when said pipesare withdrawn.

2. A suction cleaning system for wood Working tools and the like, havinga plug rality of fixed conduits and intake ports therefor, removablesuction pipes and automatic means for closing said ports when said pipesare withdrawn, said means comprising a valve disk held in theinoperative 2 position by the removable pipe, but free to swing int-0register with the port when the pipe is withdrawn.

In testimony whereof, I attix my signature in the presence of twowitnesses this second day of August 1912.

HENRY G. CONRAD.

lVitnesses FRANoIs V. PARKER, J12, MINNIE M. LINDENAU.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. 0.

